/Engine/Source/Developer/Localization/Public/LocTextHelper.h
Add a new source text entry to the manifest.
Returns true if it was added successfully (or if a matching entry already exists), false if a duplicate entry was found with different text (an identity conflict).
bool AddSourceText ( const [FLocKey](API\Runtime\Core\Internationalization\FLocKey) & InNamespace, const [FLocItem](API\Runtime\Core\Internationalization\FLocItem) & InSource, const [FManifestContext](API\Runtime\Core\Internationalization\FManifestContext) & InContext, const [FString](API\Runtime\Core\Containers\FString) * InDescription )